Propeller-screw.



} W. G. G. WEIDINGER.

PROPELLER SCREW.

APPLICATION FILED OUT. 28, 1912.

1 1 23, 1 52. Patented Dec. 29, 1914.

WILLIAM G. G. WEIDINGER, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-THIRD TO EDA WEIDINGER AND ONE-THIRD T0 EMMA WEIDINGER, BOTH OF CHICAGO, ILLINOIS.

PROPELLER-SCREV.

Specification of Letters Patent.

Patented Dec. 29, 19314.

Application filed October 28, 1912. Serial No. 728,082.

To all whomit may concern:

Be. it known that I, WILLIAM G. G. WEID- menu, a citizen of the United States, residing at the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Propeller- Screws, of which the following.

is a specification; 1

My invention relates to propeller screws for marine and aerial use.

The object is to brin'gabout a more economical application of power applied, and to increase the efficiency of the propeller by giving it agreater grip on the fluid medium in which it operates, thereby diminishing the slip and the tendency to churn, which are characteristic of the ordinary propelle-r.

/ The principles of my invention are illustrated in the drawings, in which- '5. These are extended outwardly and back wardly at any desired pitch, which, however, will vary according to the service to be performed. The outer peripheral edges of the blades are substantially in a straight line from front to rear, and extended therefrom is a flange or fin 6. It maybe integral with the propeller blade as preferred, and extends from the point a to the front edge at b. This flange should be transversely curved throughout its length, and the cur- "rature at any point may be in the are of a circle whose center is the corresponding point on the longitudinal axis of the screw and whose periphery is described by the revolution of those points on the outer edge of the screw from which the said' flange springs and wh ch are cut by a line at right angles to the said point on the longitudinal axis. It will be seen that when the flangeturns with the screw, the edge I)- cuts'the wa ter, and .the. body portion thereof follows through without resistance. At the same time the propeller-"blade, by its rotation, forces the water backwardly and outwardly. The outward flow of the water is met by the flange, thereby increasing the resistance and the reaction of the water against the screw, resulting in greater efi'iciency which, at the same time, may be obtained with slower rotation and little loss of power.

I claim:

.1. A propeller screw comprising a hub,

blades extended outwardly therefrom and ha ring their peripheral edges in a substantially straight line, and flanges springing from the peripheral edges of said blades extended forwardly in a. curve substantially corresponding to the arc of their normal revolution.

2. A propeller screw comprising a hub, blades extended outwardly therefrom, and

flanges springing from the peripheral edges of said blades extended forwardly therefrom and substantially conformed in cross section at each point throughout their length to the are of revolution of the corresponding point at which the said flanges spring from the said blade.

3. A propeller screw comprising a hub, blades extended outwardly therefrom and having their peripheral edges in a sub-- stantially straight line and flanges springing from the peripheral edges of said blades extended forwardly therefrom and substantially conformed in cross section at each point throughout-their length to the arc of revolution of the corresponding point at which the said flanges spring from the said blades.

4. A propeller screw comprising a -hub, blades extended outwardly therefrom and flanges springing from the peripheral edges of said blades and extended forwardly therey from, said flanges having a contour substan- 1912, in the presence of two subscrikging wittially coxretsponfiling tola SBCtiOl ggf'al figure; nesses.

generate y t erevo ution o t e ine 0 a the peripheral edges of said blades about L W A G' WEIDINGER' a their-axis. Witnesses:

In witness whereof, I have hereto sub- C. K. CHAMBERLAIN, scribed by r ame this 23rd day .of October A. S. PHILLIPS. 

